Rotary engine



No. 608,76l. Patented Aug. 9. i898. C. DAVIDSON R. D. STACEY. ROTARY ENGNE.

(Application led June 9, 1897.) l (No Model.) 5 Sheets-Sheet l.

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` Patented Allg. 9, |898. C. DAVIDSN 8L R. D. STACEY.

ROTARY ENGINE. Y (Appuwtion filed June 9, 1897.)

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Y NIM IIIHILIW lum illllllilllllllll Unirse I, Sterns ATT `EF1Qt CHARLES DAVIDSON AND RICHARD D. STACEY, OF NEW IIAGERSTOWN,

OHIO.

ROTARY ENGINE.

SPECIFICATION forming Apart of Letters :Patent No. 608,761, dated August 9, 1898. Appiimiml'final-une 9, 189,7IV serai No. 640,098. (No model.)

O ur invention has relation to improvem ents in reversible rotary steam-engines; and the object is to provide a simple, economical, and effective motor of this class.

To this end the novelty consists in the construction, combination, and arrangement of the same, as will be hereinafter more fully described, and particularly pointed out in the claims.

In the accompanying drawings the same reference characters indicate the same parts of the invention.

Figure 1 is a perspective view of our iinproved reversible rotary steam-engine. Fig. 2 is an end elevation. Fig. 3 is a longitudinal section. Fig. 4 is a horizontal section. Fig. 5 is a perspective view ot' the rotarypisrings and packing bars and' followers detached. Fig. G is a transverse section on the line G 6 of Fig. 4. Fig. 7 is a similarview on the line 7 7 of Fig. 4. Fig. 8 is a similarview on the line 8 8 of Fig 4.

l represents a horizontal cylinder, provided with the transverse parallel legs 2 2, which are secured to the foundation 3. 4 4 represent the cylinder-heads, through which the rotary piston-shaft 6 extends, and

the opposite projecting ends of said shaft are journaled in the adjustable bearings 7 7 on the pillow-blocks 8 8.

9 10 represent the steam-chests, longitudinally arranged parallel and in the same horizontal plane on opposite sides of the cylinder, as shown.

12 represents the right-hand or go-ahead port inthe chest 9, and 13 the corresponding alined port in the chest lO.

14 represents the left-hand or backing port in the chest 9, and 15 thecorresponding portin the chest lO.

The ports 12 and 13 are supplied with live steam by a branch pipe 16, centrally connected to a valve ,17, which communicates with a horizontal pipe 18, to the opposite end of `which is connected a similar valve 19, which in turn is lcentrally connected to a branch pipe 20, the ends of,l which communicate with the left-hand ports 14 and 15.

21 represents the main steam-pipe leading from the boiler.

22 23 represent the valve-steine, provided with the levers 24 and 25, connected by the bar 26, and these stems are so arranged that when the levers 24 25 are vertical both valves are closed,I and if the levers be moved to thc left the valve 17 will be opened and the valve 19 closed, and `vice versa.

27 represents the exhaust-port, which c orand 28 represents the corresponding exhaustport for the live-steam ports 14 and 15. These exhaust-ports 27 and 2S are connected by a common passage 29 with the exhaust-pipe 30.

3l represents the rotary piston, fixed on the piston-shaft 6, and it is formed with the annular rabbeted end recesses 32 32 and the parallel annular 4recesses 33 33, which receive `the usual packing-rings 34 35. ton removed from the cylinder, the packing- 1 36 36 represent follower-disks adjustably Asecured to the opposite ends of the piston 3l by the countersunk head-screws 37 37, and 38 represents adjusting-screws projecting `through the cylinder-heads 4 4 for conveniently setting up the followers to compensate for the wear on the edges of the packing-rings. f Y

39 3 9 represent longitudinal packinggrooves, in the `bottom of each of which is located a semi-elliptical spring 40, removably secured in place by acountersnnk headscrew41, and 42 represents packing-bars, one of which is located in each packing-groove and is pressed outwardly by the action of said spring toform a steam-tight joint between the piston and the cylinder.

w43 43 represent an annular series of rectangular pockets, circumferentially arranged in `the rotary piston and in the same plane as `the steam-ports 12, 13, and 27, parallel with l a corresponding series of oppostely-disposyed pockets 44 44, arranged in the same plane as the steam-'ports145 15,* and 28.- 'Each pocket `responds to the live-steam ports 12 and 13,

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in both series is formed with a radial Wall 45, which presents a right-angular point of impact to its respective live-steam port to insure the greatest degree of eliiciency of the live steam, and, as shown in Fig. 6, each series of pockets is so arranged on the piston with reference to its respective live-steam port that one pocket is just opening a port to receive a fresh impetus before the corresponding pocket on the opposite side has entirely closed its port, so that a pocket is always in position to receive live steam from one or the other of its ports, no matter what position the piston may be in. lonsequently there can be no dead-center.

46 represents a diagonal passage-way extending upward and outward from each pocket in the piston and terminates in the bottom of the contiguous rabbeted recess 32 immediately under the packing-ring, so that ille steam from the pocket acting on said ring presses it outwardly to form a joint with the cylinder. Similar steam-passages 47 are provided at the opposite ends of the pockets tol connect with the annular recesses 33 to perform the same office for their respective packing-rings.

48 48 represent corresponding steam passage-ways extending from the forward end of each pocket to its contiguous packing-groove to admit the live steam from said pocket to said groove to press its packingbar outwardly, as in the case of the packing-rings. The outer ends of the passage-Ways 4S each terminate in a conical valve-seat to receive a small outwardly-opening check-valve 57, which prevents the back passage of the steam and the consequent relaxation of the packing-springs and their bars when the pockets are passing the exhaust-ports.

Each pillow-block S is provided with an adjustable bearing 7, as heretofore mentioned, and it will be noticed that the upper horizontal plane face 49 of each pillow-block is in the saine horizontal plane as the lower edge of the piston, so that by removing the cylinder-head and the hearing the piston may be withdrawn endwise and its end supported on the face of said block while the usual repairs are made to the packing. The bottom of each bearing 7 is formed with oppositely-diverging inclined faces 50 50, which rest upon the correspondingly-inclined faces of the movable Wedges 51 51, which in turn rest upon the horizontal face 49 of the pillow-block, and 52 represents a verticalscrew passing through the pillow-block and engaging the lower half of the bearing to rigidly secure it in place after it has been properly adjusted or lined up,7 and 53 53 represent integral vertical lugs on the face 49 of the pillow-block, in which are j ournaled the horizontal adjustingscrews 54 54, the inner threaded ends of which engage the outer ends of the wedges 51, to conveniently adjust them with reference to the bearings.

Suitable oil-cups 55 55 are provided for the piston-shaft bearings, and corresponding oilreceptacles 5G 5G are fixed to the cylinder in line with the packing-rings, and as the annular grooves in which these packing rings are secured communicate with longitudinal grooves it follows that the oil is evenly and regularly distributed over the entire inner surface of the cylinder.

Although we have specifically described the construction and relative arrangement of the several elements of our invention we do not desire to be confined to the same, as such changes or modifications may be made as clearly fall within the scope of our invention Without departing from the spirit thereof.

Having thus fully described our invention, whatwe claim as new and useful, and desire to secure by Letters Patent of the United States, isw

1. A reversible rotary steam-engine, coinprising a cylinder 1, provided with the alined live-steam ports, 12 and 13, and the alined intermediate exhaust-port 27, the removable cylinder-heads 4 4, the branch steam-inlet pipe 16, having its opposite ends terminating in said ports 12 and 13 and an intermediate valve fixed in said branch pipe and adapted to simultaneously control the admission of steam to both ports 12 and 13, in combination with the rotary piston 31, provided with the annular series of rectangular steam-pockets 43, the radial walls 45 of which are arranged at a right angle to said live-steam ports, annular packing-recesses 33 and 32 and longitudinal packing-grooves 39 intersecting said recesses and a series of diagonal steam passage-Ways 46 and 47 connecting said pockets with said packing-recesses and intersecting grooves, the packing-rings 34 and 35 arranged in said recesses, and the semi-elliptical springs 40 and the packing-bars 42 arranged in said grooves, substantially as shown and described.

2. In rotary engines, a fixed cylinder provided on opposite sides with steam-chests having two sets of duplicate live-steam ports and f an exhaust-port for each set, in combination with a rotary piston provided with the annular series of rectangular steam-pockets 43, the radial walls 45 of which are arranged at a right angle to said live-steam ports, annular packing-recesses 32 and 33 and longitudinal packing-grooves 39 intersecting said recesses and a series of diagonal steam passage-ways 46 and 47 connecting said pockets with said packing recesses and intersecting grooves, the packing-rings 34 and 35 arranged in said recesses, the semi-elliptical springs 40, and the packing-bars 42 arranged in said grooves,sub stantially as described.

In testimony whereof we affix our signatures in presence of two witnesses.

CHARLES DAVIDSON. RICHARD D. STACEY. Vitnesses:

W. A. RENNECKAR, JAs. WILsoN.

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